Beamed and unbeamed emission of $\gamma$-ray blazars

Abstract

A two-component model of radio emission has been used to explain some radio observational properties of Active Galactic Nuclei (AGNs) and, in particular, of blazars. In this work, we extend the two-component idea to the $\gamma$-ray emission and assume that the total $\gamma$-ray output of blazars consists of relativistically beamed and unbeamed components. The basic idea leverages the correlation between the radio core-dominance parameter and the $\gamma$-ray beaming factor. To do so, we evaluate this correlation for a large sample of 584 blazars taken from the fourth source catalog of the Fermi Large Area Telescope (Fermi-LAT) and correlated their $\gamma$-ray core-dominance parameters with radio core-dominance parameters. The $\gamma$-ray beaming factor is then used to estimate the beamed and unbeamed components. Our analysis confirms that the $\gamma$-ray emission in blazars is mainly from the beamed component.

arXiv commentAccepted by Publications of the Astronomical Society of the Pacific

References in corpus (24)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• Fermi Large Area Telescope Fourth Source Catalog
• Fermi Large Area Telescope Second Source Catalog
• MOJAVE: Monitoring of Jets in Active Galactic Nuclei with VLBA Experiments. VI. Kinematics Analysis of a Complete Sample of Blazar Jets
• Constraints on the Physical Parameters of TeV Blazars
• Doppler factors, Lorentz factors and viewing angles for quasars, BL Lacertae objects and radio galaxies
• The First Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• Comptonization of Infrared Radiation from Hot Dust by Relativistic Jets in Quasars
• The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• The transition between BL Lac objects and Flat Spectrum Radio Quasars
• Synchrotron Self-Compton Analysis of TeV X-ray Selected BL Lacertae Objects
• Fermi Gamma-ray Imaging of a Radio Galaxy
• Discovery of very high energy gamma-ray emission from Centaurus A with H.E.S.S
• Gamma-Ray Studies of Blazars: Synchro-Compton Analysis of Flat Spectrum Radio Quasars
• Extended radio emission in MOJAVE Blazars: Challenges to Unification
• Constraining the limiting brightness temperature and Doppler factors for the largest sample of radio bright blazars
• Multi-wavelength observations of 3C 279 during the extremely bright gamma-ray flare in 2014 March-April
• The central black hole masses and Doppler factors of the $\gamma$-ray loud blazars
• Identification of the Early Fermi LAT Gamma-Ray Bright Objects with Extragalactic VLBI sources
• A test on external Compton models for $\gamma$-ray active galactic nuclei
• The relationship between the radio core-dominance parameter and spectral index in different classes of extragalactic radio sources (II)
• Beaming Effect in Fermi Blazars
• The relationship between the radio core-dominance parameter and spectral index in different classes of extragalactic radio sources (III)
• A Determination of the Gamma-ray Flux and Photon Spectral Index Distributions of Blazars from the Fermi-LAT 3LAC

Cited by in corpus (2)

• The Estimation of Fundamental Physics Parameters for Fermi-LAT Blazars
• Radio Core-Dominance of Fermi-Blazars: Implication for Blazar Unification